Portable toilet



FIG. 1 is a first perspective view of a portable toilet showing my new design;

FIG. 2 is a second perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof;

FIG. 8 is a bottom view thereof; and,

FIG. 9 is a perspective view of another state of the portable toilet thereof.

The broken lines shown in the drawings depict portions of the portable toilet that form no part of the claimed design. 

CLAIM The ornamental design for a portable toilet, as shown and described. 